I have an English White Coturnix that lays rotten eggs. She has ever since I bought her about 8-10 weeks ago. I don't know how old she is but I know she was at least 4-5 months old when I bought her, who knows she may be up to a year old. These eggs are very thin shelled, black or rotten green in colour, and are just all around disgusting. She acts fine, eats normally and its a high protein diet, has free access to fine oyster shell. She doesn't act sick and doesn't have any lice or mites (I dusted them about a month after I got them). She doesn't lay regularly. Maybe an egg a week and they are all like that. I thought she may have been eggbound or something but she doesn't act sick and her belly seems normal. She had started to lay a bit more regularly and the eggs seemed to be improving but now I'm back to square one. Does anyone have any ideas on what is causing this? Should I seperate her and give her some antibiotics just in case? Or should I just be done with her and use her for puppy training?